package com.yuehuanghun.admin.core.config.util;

import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.io.FilenameUtils;
import org.springframework.web.multipart.MultipartFile;

import com.yuehuanghun.admin.core.config.Constants;
import com.yuehuanghun.admin.core.config.SystemProperties;
import com.yuehuanghun.framework.exception.ValidateException;
import com.yuehuanghun.framework.util.DateUtils;
import com.yuehuanghun.framework.util.IdUtils;
import com.yuehuanghun.framework.util.StringUtils;
import com.yuehuanghun.framework.util.file.MimeTypeUtils;

/**
 * 文件上传工具类
 *
 * @author yadmin
 */
public class FileUploadUtils {
	/**
	 * 默认大小 50M
	 */
	public static final long DEFAULT_MAX_SIZE = 50 * 1024 * 1024;

	/**
	 * 默认的文件名最大长度 100
	 */
	public static final int DEFAULT_FILE_NAME_LENGTH = 100;

	/**
	 * 默认上传的地址
	 */
	private static String defaultBaseDir = SystemProperties.getProfile();

	public static void setDefaultBaseDir(String defaultBaseDir) {
		FileUploadUtils.defaultBaseDir = defaultBaseDir;
	}

	public static String getDefaultBaseDir() {
		return defaultBaseDir;
	}

	/**
	 * 以默认配置进行文件上传
	 *
	 * @param file 上传的文件
	 * @return 文件名称
	 * @throws Exception
	 */
	public static final String upload(MultipartFile file) throws IOException {
		try {
			return upload(getDefaultBaseDir(), file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
		} catch (Exception e) {
			throw new IOException(e.getMessage(), e);
		}
	}

	/**
	 * 根据文件路径上传
	 *
	 * @param baseDir 相对应用的基目录
	 * @param file    上传的文件
	 * @return 文件名称
	 * @throws IOException
	 */
	public static final String upload(String baseDir, MultipartFile file) throws IOException {
		try {
			return upload(baseDir, file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
		} catch (Exception e) {
			throw new IOException(e.getMessage(), e);
		}
	}

	/**
	 * 文件上传
	 *
	 * @param baseDir          相对应用的基目录
	 * @param file             上传的文件
	 * @param allowedExtension 上传文件类型
	 * @return 返回上传成功的文件名
	 * @throws IOException                          比如读写文件出错时
	 */
	public static final String upload(String baseDir, MultipartFile file, String[] allowedExtension)
			throws IOException {
		int fileNamelength = file.getOriginalFilename().length();
		if (fileNamelength > FileUploadUtils.DEFAULT_FILE_NAME_LENGTH) {
			throw new ValidateException(String.format("文件名长度超出限制，不可大于%s", FileUploadUtils.DEFAULT_FILE_NAME_LENGTH));
		}

		assertAllowed(file, allowedExtension);

		String fileName = extractFilename(file);

		File desc = getAbsoluteFile(baseDir, fileName);
		file.transferTo(desc);
		String pathFileName = getPathFileName(baseDir, fileName);
		return pathFileName;
	}

	/**
	 * 编码文件名
	 */
	public static final String extractFilename(MultipartFile file) {
		String fileName = file.getOriginalFilename();
		String extension = getExtension(file);
		fileName = DateUtils.datePath() + "/" + IdUtils.fastUUID() + "." + extension;
		return fileName;
	}

	private static final File getAbsoluteFile(String uploadDir, String fileName) throws IOException {
		File desc = new File(uploadDir + File.separator + fileName);

		if (!desc.getParentFile().exists()) {
			desc.getParentFile().mkdirs();
		}
		if (!desc.exists()) {
			desc.createNewFile();
		}
		return desc;
	}

	private static final String getPathFileName(String uploadDir, String fileName) throws IOException {
		int dirLastIndex = SystemProperties.getProfile().length() + 1;
		String currentDir = StringUtils.substring(uploadDir, dirLastIndex);
		String pathFileName = Constants.RESOURCE_PREFIX + "/" + currentDir + "/" + fileName;
		return pathFileName;
	}

	/**
	 * 文件大小校验
	 *
	 * @param file 上传的文件
	 * @return
	 */
	public static final void assertAllowed(MultipartFile file, String[] allowedExtension) {
		long size = file.getSize();
		if (DEFAULT_MAX_SIZE != -1 && size > DEFAULT_MAX_SIZE) {
			throw new ValidateException(String.format("文件超出大小超出限制：%sM", DEFAULT_MAX_SIZE / 1024 / 1024));
		}

		String extension = getExtension(file);
		if (allowedExtension != null && !isAllowedExtension(extension, allowedExtension)) {
			throw new ValidateException(String.format("不允许上传的文件类型"));
		}

	}

	/**
	 * 判断MIME类型是否是允许的MIME类型
	 *
	 * @param extension
	 * @param allowedExtension
	 * @return
	 */
	public static final boolean isAllowedExtension(String extension, String[] allowedExtension) {
		for (String str : allowedExtension) {
			if (str.equalsIgnoreCase(extension)) {
				return true;
			}
		}
		return false;
	}

	/**
	 * 获取文件名的后缀
	 *
	 * @param file 表单文件
	 * @return 后缀名
	 */
	public static final String getExtension(MultipartFile file) {
		String extension = FilenameUtils.getExtension(file.getOriginalFilename());
		if (StringUtils.isEmpty(extension)) {
			extension = MimeTypeUtils.getExtension(file.getContentType());
		}
		return extension;
	}
	
	private static final Map<String, String> SUFFIX_FILETYPE_MAPPING = new HashMap<>();
	
	static {
		SUFFIX_FILETYPE_MAPPING.put("doc", "word");
		SUFFIX_FILETYPE_MAPPING.put("docx", "word");
		SUFFIX_FILETYPE_MAPPING.put("xls", "excel");
		SUFFIX_FILETYPE_MAPPING.put("xlsx", "excel");
		SUFFIX_FILETYPE_MAPPING.put("ppt", "ppt");
		SUFFIX_FILETYPE_MAPPING.put("pptx", "ppt");
		SUFFIX_FILETYPE_MAPPING.put("pdf", "pdf");
		
		SUFFIX_FILETYPE_MAPPING.put("jpg", "image");
		SUFFIX_FILETYPE_MAPPING.put("jpeg", "image");
		SUFFIX_FILETYPE_MAPPING.put("png", "image");
		SUFFIX_FILETYPE_MAPPING.put("gif", "image");
		SUFFIX_FILETYPE_MAPPING.put("bmp", "image");
		SUFFIX_FILETYPE_MAPPING.put("webp", "image");
		SUFFIX_FILETYPE_MAPPING.put("raw", "image");
	}
	
	public static final String suffixToFileType(String suffix) {
		if(StringUtils.isBlank(suffix)) {
			return StringUtils.EMPTY;
		}
		
		return SUFFIX_FILETYPE_MAPPING.getOrDefault(suffix, "other");
	}
}
